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A Mandalay Bay Resort and Casino security guard and building engineer, who were the first to encounter Las Vegas shooter Stephen Paddock, recounted their harrowing experience Wednesday on "The Ellen DeGeneres Show."

Jesus Campos and Stephen Schuck were both working at Mandalay Bay the evening of Oct. 1 when shots rang out from the 32nd floor of the resort onto a crowd attending the a country music festival.

Campos said he was notified about a door that was left open on the 32nd floor. He was eventually shot in the leg by Paddock, but managed to radio for help.

"As I was walking down [the hallway] I heard rapid fire," an emotional Campos told DeGeneres. "I felt a burning sensation, I want to go lift my pant leg up and I saw the blood."

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(Published Wednesday, March 20, 2019)

Schuck, the buildings engineer, also went to investigate a door was left open and eventually stumbled across a wounded Campos.

Mandalay Bay building engineer Stephen Schuck he thought he was hearing jackhammers.

But then he realized there wouldn't be construction on a Sunday night. The shooter opened fire out the windows at a concert below Oct. 1, killing 58 people.